Adding device.



L. E. COLEMAN. ADDING DEVICE.

APPLICATION FILED JAN. 21, 1903. RENEWED FEB. 10, 1906.

PATENTED APR. 3,.1906.

UNITED STATES PATENT OFFTCEQ LUCIUS E. COLEMAN, OF SANTA ANA,CALIFORNIA, ASSIGNOR TO IVILLIAM H. SPAKE, OF ANAHEIM, CALIFORNIA.

ADDING DEVICE.

Specification of Letters Patent Patented April 3, 1906.

Application filed January 21, 1903. Renewed February 10. 1906. SerialNo! 300,496.

To all whom, it may concern:

Be it known that I, LUoIUs E. COLEMAN, a citizen of the United States,residing at Santa Ana, in the county of Orange and State of California,have invented a new and useful Adding Device, of which the following isa specification.

This invention relates to an improved add ing device, and moreparticularly to a disk for registering the tens in adding a column offigures, and has for its object to provide a simple, inexpensive, andeflicient device of this character adapted to assist a person in theprocess of addition and by means of which one or more columns of figuresmay be quickly and accurately added without unnecessarily burdening ortaxing the memory with a multiplicity of figures.

A further'object of the device is to provide a registering-disk forregistering the tens in a column of figures in the process of addition,the right-hand digit being kept in the mind and varied according to thechange neces sitated by the addition of a figure or group of figures inadding the column.

The invention consists in a disk having stamped, embossed, or otherwiseimprinted on its face an annular row or series of numerals representingtens in consecutive order from one to twenty-six or more, the periphcryof the disk being provided with notches or depressions corresponding tothe numbers representing the tens inscribed on its face, the disk beingadapted to be held in the hand and rotated, the forefinger engaging thepar ticular notch or depression in the periphery of the diskcorresponding to the tens in a column of figures as they appear inadding.

The invention further consists in the con struction and novelcombination and arrangement of parts hereinafter fully described,illustrated in the accompanying drawings, and pointed out in the claimshereto appended.

In the drawings, Figure 1 is a perspective view showing the manner ofoperating the regulating-disk. Fig. 2 is a rear view of the same.

Similar numerals of reference indicate corresponding parts in bothfigures of the drawings.

l designates the register, which consists of a flat disk 2, circular incontour and formed of sheet metal or other suitable material, beingpreferably die-struck and formed with appear directly under eachperipheral notches or depressions 3, defining a series of radiatingpoints or spurs 4. On the face of the disk 2 and preferably near itsperiphery are stamped, embossed, or otherwise imprinted an annular rowor series of numerals representing in consecutive order tens from one totwenty-six or more, and these numerals are preferably arranged on theface of the disk, so that one number will of the radiating points orspurs 4. On the rear side or face of the disk 1 are inscribed asimilarly-arranged annular row of numerals, the notches or depressionsin the periphery of the disk coacting in like manner to register thetens, or, if-desired, the numerals instead of being arranged directlyarranged below the notches or depressions, as clearly shown in Fig. 2 ofthe drawings. The spurs 4 are preferably slightly rounded, as shown, toprevent pricking or otherwise lacerating the fingers while operating theregister.

In practice the disk is held in the left hand with the forefingerresting in the notch or depression represented by the higher numeral 26in the present instance, as clearly shown in Fig. 1 of the drawings, andin adding a column of figures the tens are registered on the disk bymoving the finger from one notch to the next as they appear in theprocess of adding, the units only being carried from one figure or groupof figures to the next. For instance, if it is desired to add 89, -97,68, and 46 one would proceed as follows for the first column: Six andeight are fourteen; the ten is registered on the disk by moving thefinger in the first notch and the four units carried. Four and seven areeleven; move the finger to the second notch and carry the one. One andnine are ten; move the finger to the third notch and put down 0. Now bylooking at the register we find we have registered three tens, so wehave three to carry to the next column, and so on. Any number of columnsof any length may be added in like manner, not more than eighteen unitsbeing carried in the mind at one time.

From the foregoing description it will be seen that I have provided anexceedingly simple, inexpensive registeringdisk by me ans of which theadding of one or more columns of figures is greatly facilitated, whichmay be under the spurs may be used for instructing children inarithmetical problems, as Well as by auditors in general, and being ofapproximately the size and shape of a coin may be carried as apocket-piece.

While I have only shown the numerals representing the tens running fromone to tWenty-siX, it is obvious that the disk may be provided With asmany numbers as desired, and various changes in form, proportion, andminor details of construction may be resorted to Without departing fromthe principle or sacrificing any of the advantages of the invention.

Having thus described the invention, What I claim is A device forkeeping account of the tens in the process of addition comprising alight portable disk adapted to be held in the hand and revolved one stepwhenever ten units have been added, said disk having peripheral notchesand spurs, such spurs being of surficient height to indicate by theirpassages over the thumb and finger that the disk has been moved onenotch, said disk bearing on its opposite faces marginal roWs ofnumerals, each numeral being disposed adjacent to one of the notches ordepressions for the purpose specified.

In testimony that I claim the foregoing as my oWn I have hereto affixedmy signature in the presence of two Witnesses.

LUOIUS E. COLEMAN.

Witnesses H. C. HILL, T. M. HILL.

